<p>
  By a result of <span class="name">Ibukiyama</span> (On Siegel modular varieties of level 3. Internat. J. Math. 2 (1991), 17-35, 
<a href="http://www.ams.org/mathscinet-getitem?mr=MR1082834">MR1082834</a>),
  the ring blah blah blah

</p><p>

  There exists a relation between these generators, namely...
</p>
